The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 1987
Filed:
Jul. 22, 1985
NGK Insulators, Ltd., Nagoya, JP;
Abstract
Disclosed herein is a discharge tube for a high pressure metal vapor discharge lamp, which discharge tube comprises a translucent alumina tubular body, a lower end plate bonded to one end portion of the alumina tubular body which has an electrode support member inside thereof and is bonded to the alumina tubular body when the alumina tubular body is subjected to the light transmission treatment through firing, another end plate which has an electrode support member inside thereof and is bonded to the other end of the translucent alumina tubular body by means of a frit. This discharge tube is produced by inserting an end plate in which an electrode support member is partially embedded on the inner side thereof into one end portion of a tubular body made of high purity alumina, firing the green or calcined tubular body with the end plate, so that the tubular body is made translucent and simultaneously the end plate is bonded to the tubular body, and attaching another end plate to the other end of the alumina tubular body with the frit.